Air-heater.



H. S. WILLIAMS.

AIR HEATER.

APPLICATION FILED MAR.17, 1914.

Patented Mar. 30, 19115.

2 SHEETS-SHEET l.

Q g k WITNESSES: l/VVE/VTOR WW! alf/"7 d Wyn dam W WMKZNH A TTOR/VEY THE NORRIS PETERS 60.. PHOm-L|THO.. WASHINGmN. 11 C H. S. WILLIAMS.

AIR HEATER.

APPLICATION FILED MARI'Z, 1914. 1 1M 35 Patented Mar.30,1915.

2 SHEETS-SHEET 2.

WITNESSES: I III l/E IV TOR A TTOR/VEV THE NORRIS PETERS Co. PHOTO-LITHQ, WASHINGTON, D. c

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T T@ l I HARRY s. WILLIAMS, OF DETROIT, MICHIGAN, ASSIGNQR To THE PETER s ITH HEATER COMPANY, OF DETROIT, MICHIGAN, A CORPORATION or MICHIGAN.

AIR-HEATER.

Specification of Letters Patent.

Patented Mar. 3d, 1915.

Application filed March 17, 1914. Serial No. 825,387.

To all whom it may concern:

Be it known that I, HARRY S. WILLIA s, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Air- Heaters, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to air heaters of that type provided with mechanical means for normally propelling the air through the heater casing, such for instance as an electrically driven fan.

It is the object of the invention toprovide automatic means for opening an exit to the heater casing whenever the air is not mechanically propelled therethrough and for closing said exit when the propelling means is in operation. To this end tllQlIlVGIltlOIl comprises the construction as hereinafter set forth.

In the drawings: Figure 1 1s a vertical section through the heater; Fig. 2 is a horizontal section therethrough; and Figs. 3 and 4: are perspective views of the sections forming the double head of the heater.

The heater to which my improvement is applied, comprises an outer casing A preferably formed of sheet metal, and an inner casing B which surrounds the heating stove (not shown).

C is a hollow head forming a top for the casings A and B, preferably formed of cast metal and in two sections 0' and C The lower section C has a circular portion D which forms a head or cap for the inner sheet metal casing B.

E is an oblong opening in the head D, and F is an upwardly-extending flange bounding three sides of this opening and extending laterally beyond the same to form a flaring box or conduit G.

H are inclined ribs upon the flange F which are formed continuous with the lip H on one side of the aperture E. The top section C of the head flts over the flange F, being provided with a nipple I for connection with the external air conduit, and also with a nipple J which registers with a nipple K in the section C, with a connecting sheet metal conduit L therebetween.

The construction as above described is one which forms in connection with the sheet metal casings A and B an inner chamber M for the stove (not shown), and an outer sur rounding air chamber N which communicates with the space between the sections C and C of the head C. The conduit L divides this space from the smoke flue which passes out from the inner casing, while the flange F and flaring extension G form an air flue communicating at the top with the nipple I and at the side with a lateral opening in the casing. In normal operation the air to be heated is mechanically propelled by a suitable fan (not shown), and enters the nipple I, being forced downward through the aperture E into the inner chamber M. When, however, the mechanical propulsion is not in operation, the hot air rising from the chamber M is permitted to escape through the lateral extension of the conduit and opening in the side of the casing.

To cause the air to flow in the proper direction, it is necessary to close the lateral opening when the air is mechanically propelled and to close the top opening when the air circulates merely by the action of gravity. For this purpose I have provided a hinged valve or damper O which is pivotally secured at P near the top section C and is adapted to lie adjacent to the inclined ribs H and lip H, to close the lateral opening. In another position ofadjustment, as shown in Fig. 1, the valve extends in an inclined direction across the vertical conduit to close the same and to form a deflector for causing the rising air to pass laterally outward. To render the operation of the valve automatic, I have provided a weighted arm Q, which holds the valve in the position shown in Fig. 1 when the mechanical propulsion is not in operation, but whenever the air is thus mechanically propelled the downward pressure against the valve will cause it to move against the ribs H and lip H, thereby closing the lateral opening and opening the vertical passage. The effect of the air pressure upon the valve is increased by providing an upturned flange R at its outer end, which forms a bearing against which the air current impinges.

With the construction described the operation of the valve is entirely automatic, and whenever the air is mechanically propelled it will be directed downward through opening into a position obstructing said con- 15 duit adjacent to said opening, means for yieldably holding said damper in the latter position, and a flange at the free end of said damper adapted for the impingement of an air current directed to the casing through 20 the conduit to move said damper into a position closing said opening.

In testimony whereof I aflix my signature in presence of two witnesses.

HARRY S. WILLIAMS. Witnesses:

JAMES P. BARRY, ADELAIDE I. ADAMS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0." 

